Implement "flip" image transforms on Haiku

Implement "flip" image transforms on Haiku

* src/dispextern.h (struct image): New field `transform',
`original_width' and `original_height'.
* src/haiku_draw_support.cc (BView_DrawMask): Rename to
`be_draw_image_mask' and fix coding style.
(rotate_bitmap_270, BBitmap_transform_bitmap, rotate_bitmap_90):
Delete functions.
(be_apply_affine_transform): New function.
(be_apply_inverse_transform): New function.

* src/haiku_support.h: Update prototypes.

* src/haikuterm.c (haiku_translate_transform): New function.
(haiku_draw_image_glyph_string): Use affine transforms to
implement images.

* src/image.c (image_set_transform): Implement using affine
transforms on Haiku too.